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From: "Walter Roberson" <roberson@ibd.nrc-cnrc.gc.ca>
Newsgroups: comp.soft-sys.matlab
Subject: Re: Olivia
Date: Tue, 28 Oct 2008 21:50:03 +0000 (UTC)
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"Olivia " <livianf@yahoo.com> wrote in message <ge7inm$h50$1@fred.mathworks.com>...

> I'm trying to model a technology. I carried out the measurements using its signals and wrote the modelling functions
> wrt the power delay profile according to my model.
> The prob is, the model is based only on descending graphs but I got some ascending parts on my graph from the measurement. I
> therefore derived two modelling functions in matlab for both parts. Can someone tell me how I can combine these two functions
> so that it suits my graph?

[Sorry about the empty response; the matlab central newsreader is being a pain.] 

Are you talking about something like Modular Transfer Functions?
Or are you talking about Simulink? Or something different?
'model' has a lot of different and potentially relevant meanings.